公开(公告)号：US20230343952A1

公开(公告)日：2023-10-26

申请号：US18002197

申请日：2021-06-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI

IPC: H01M4/525 ,  H01M4/1315 ,  H01M10/04 ,  H01M4/04 ,  C01G51/00

CPC classification number: H01M4/525 ,  H01M4/1315 ,  H01M10/049 ,  H01M4/0471 ,  C01G51/42 ,  H01M2004/028

Abstract: A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material with high charge and discharge voltage is provided. A positive electrode active material that hardly deteriorates is provided. The positive electrode active material is formed through a plurality of heating steps. The second and subsequent heating steps are preferably performed at a temperature higher than or equal to 742° C. and lower than or equal to 920° C. for longer than or equal to an hour and shorter than or equal to 10 hours. Through the heating, magnesium, fluorine, and the like are distributed in a surface portion of the positive electrode active material with preferable concentrations. The crystal structure of general lithium cobalt oxide is easily broken because it becomes the H1-3 phase type crystal structure when being charged at 4.6 V; on the other hand, the positive electrode active material of the present invention has a small ratio of the H1-3 type crystal structure when being charged at 4.6 V, and has the O3′ type crystal structure where a change in the crystal structure from discharging is relatively small, and thus has excellent cycle performance.

公开(公告)号：US20230335733A1

公开(公告)日：2023-10-19

申请号：US18138790

申请日：2023-04-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Yohei MOMMA ,  Kazutaka KURIKI ,  Kazuhei NARITA

IPC: H01M4/58 ,  H01M10/0525 ,  H01M10/0562 ,  H01M50/446

CPC classification number: H01M4/582 ,  H01M10/0525 ,  H01M10/0562 ,  H01M50/446 ,  H01M2004/028

Abstract: A conduction path in an all-solid-state secondary battery is difficult to keep with a volume change in an active material due to charging and discharging in some cases. A positive electrode active material with a small volume change between the charged state and the discharged state is used for an all-solid-state secondary battery. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a crystal structure similar to the cadmium chloride type crystal structure in the charged state with a depth of charge of approximately 0.8 changes less in its volume and crystal structure between charging and discharging than known positive electrode active materials.

公开(公告)号：US20230327088A1

公开(公告)日：2023-10-12

申请号：US18204439

申请日：2023-06-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro Takahashi ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/0471 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01M10/0525 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525 ,  H01M4/628 ,  H01G11/50

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20230307622A1

公开(公告)日：2023-09-28

申请号：US18202449

申请日：2023-05-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI

IPC: H01M4/46 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/36 ,  C01G51/00 ,  H01M4/525 ,  H01M4/131 ,  H01M10/0525

CPC classification number: H01M4/466 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/366 ,  C01G51/42 ,  H01M4/525 ,  H01M4/625 ,  H01M4/131 ,  H01M10/0525 ,  C01P2002/85 ,  C01P2004/04 ,  C01P2006/40 ,  C01P2002/00 ,  G01N23/2273

Abstract: Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.

公开(公告)号：US20230290926A1

公开(公告)日：2023-09-14

申请号：US18200204

申请日：2023-05-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/625 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/366 ,  H01M4/525 ,  H01M4/8657 ,  H01M2004/021

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20230286825A1

公开(公告)日：2023-09-14

申请号：US18040286

申请日：2021-08-06

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Tetsuji ISHITANI ,  Yohei MOMMA ,  Yusuke YOSHITANI

IPC: C01G53/00

CPC classification number: C01G53/44 ,  C01P2006/40

Abstract: A manufacturing method of a highly purified positive electrode active material is provided. Alternatively, a manufacturing method of a positive electrode active material whose crystal structure is not easily broken even when charging and discharging are repeated is provided. Provided is a manufacturing method of a positive electrode active material containing lithium and a transition metal. The manufacturing method includes a first step of forming a hydroxide containing the transition metal using a basic aqueous solution and an aqueous solution containing the transition metal, a second step of preparing a lithium compound, a third step of mixing the lithium compound and the hydroxide to form a mixture, and a fourth step of heating the mixture to form a composite oxide containing lithium and the transition metal. A material with a purity higher than or equal to 99.99% is prepared as the lithium compound in the second step, and the heating is performed in an oxygen-containing atmosphere with a dew point lower than or equal to −50° C. in the fourth step.

公开(公告)号：US20230246183A1

公开(公告)日：2023-08-03

申请号：US18007789

申请日：2021-06-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Yusuke YOSHITANI ,  Azusa KIKUCHI ,  Kazuhei NARITA

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/131 ,  C01G53/00

CPC classification number: H01M4/525 ,  H01M4/366 ,  H01M4/131 ,  C01G53/66 ,  H01M2004/028

Abstract: According to one embodiment of the present invention, a positive electrode active material with high charge and discharge capacity is provided. Alternatively, a positive electrode active material with high charge and discharge voltage is provided. Alternatively, a positive electrode active material with little deterioration is provided. To improve the reliability of the positive electrode active material, the surface of the positive electrode active material is prevented from reacting with an electrolyte solution and being reduced. The provision of a projection on part of the positive electrode active material surface decreases the reduction of the positive electrode active material surface from reacting with the electrolyte solution, thereby improving the cycle performance.

公开(公告)号：US20230141951A1

公开(公告)日：2023-05-11

申请号：US17905093

申请日：2021-03-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Hiroshi KADOMA ,  Kazutaka KURIKI ,  Yumiko YONEDA ,  Kaori OGITA ,  Fumiko TANAKA ,  Yohei MOMMA ,  Shunpei YAMAZAKI

IPC: H01M10/0565 ,  H01M4/38 ,  H01M4/04

CPC classification number: H01M10/0565 ,  H01M4/386 ,  H01M4/0404 ,  H01M2004/027 ,  H01M2300/0082

Abstract: Interface contact between a polymer electrolyte and an active material layer is improved. A secondary battery with improved discharge capacity is provided. The secondary battery includes a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode. The positive electrode includes a positive electrode active material, a first lithium-ion conductive polymer, a first lithium salt, and a conductive material over a positive electrode current collector. The electrolyte layer includes a second lithium-ion conductive polymer and a second lithium salt. The conductive material is preferably graphene. The negative electrode preferably includes a negative electrode active material, a third lithium-ion conductive polymer, a third lithium salt, and a second conductive material over a negative electrode current collector.

公开(公告)号：US20230055667A1

公开(公告)日：2023-02-23

申请号：US17793194

申请日：2021-01-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Hiroshi KADOMA ,  Yoshihiro KOMATSU ,  Shiori SAGA ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  C01G53/00

Abstract: A positive electrode active material with little deterioration is provided. Positive electrode active material particles with little deterioration are provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. A novel power storage device is provided. A secondary battery includes a positive electrode and a negative electrode. In the secondary battery, the positive electrode includes a positive electrode active material; the positive electrode active material includes a crystal exhibiting a layered rock-salt crystal structure; the crystal is represented by the space group R-3m; the positive electrode active material is a particle containing lithium, cobalt, titanium, magnesium, and oxygen; the concentration of the magnesium in a surface portion of the particle is higher than the concentration of the magnesium in an inner portion of the particle; and in the positive electrode active material, the concentration of the titanium in the surface portion of the particle is higher than the concentration of the titanium in the inner portion of the particle.

公开(公告)号：US20230045920A1

公开(公告)日：2023-02-16

申请号：US17792095

申请日：2021-01-06

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Shunpei YAMAZAKI

IPC: C01G53/00 ,  C01G51/00 ,  H01M4/525

Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. One embodiment of the present invention is a positive electrode active material containing lithium, cobalt, nickel, and oxygen; in which a molar ratio of lithium, cobalt, and nickel is lithium: cobalt: nickel=1:1−x: x (0.3